Driving-chain.



G. WADHAMS & A. T. BEST.

DRIVING CHAIN.

APPLICATION FILED JUNE 18. NHL

Patented Aug. 13, 1918\ vide a bearing of ITED STATES. PATENT oEEI cE.

GEORGE WADHAMS AND ARTHUR THOMAS BEST,v 0F BIRMINGHAM, ENGLAND.

DRIVING-CHAIN.

primary object of the present invention is to improve the constructionand working of the chain there shown.

In the said prior specification the extremities of the springs bearagainst abutment plates which move angularly relatively to the guide rodwhich carries the spring, and in the chains made according to thisconstruction slight wear has been found to take place between the guiderods and the plates. V

The object of the present invention is to obviate this defect and inaccordance therewith the plates are pressed out so as to prothickness ofthe plate, while the openings in the plates are of greater diameter inthe d1-. rection of the angular movement between guide pin and platesthan in the direction 7 at right angles thereto, thus permitting freeangular movement but restraining the parts against lateral movement orshake. Referring to the drawings Fig. 1. is a side elevation showing alink of the chain according to this invention.

Fig. 2. is a longitudinal section through same with the links in theirnormal non-tensioned condition.

Fig. 3. is a similar view to Fig. 2 but showing the links in theposition which they assume under tension. 7

Fig. 4. is an enlarged sectional view through'the hole in one of theplates as at AB in Fig. 5. r Y

Fig. 5. 's an enlarged end view of one of the plates.

In carrying our invention into practice as illustrated upon theaccompanying drawings, the chain is constructed and operates in mannerdescribed in the prior specifica- Copies of this patent may be obtainedfor the guide pin of considerably greater length.

Our invention comprises improvements in greater length than theSpecification of Letters Patent. Patented Aug. 13, 1918. Applicationfiled June 18, 1917. Serial No. 175,468. 7

tion, but the openings in the plates 13 which receive the guide pinl'lcarrying the spring 12 are pressed out forming a flange around hole andthus provide a bearing for the than the thickness of the plate withconsequent decreased liability to wear at this point.

When the hole in the plateis pierced or made of a round shape in orderto allow'for the relative angular movement between the pin and plate itis necessary to provide an amount of clearance in this hole which notonly permits the angular; movement but when of a round shape permits alateral movement between pin and plate, which is also a source ofincreased wear at this point. According to the second feature of thisinvention the hole is made of elongatedform having a lateral diameterequal to that of the pin, but a diameterinthe direction'of the angularmovement ameter of the pin so as to permit the angular movement withoutlateral movement. What We claim then is 1. Adriving chain comprising aplurality of links, including alternate pairs of inner and outer plates,an abutment plate provided with by each pair of outer plates, a guiderod for each pair of abutment plates and a spring carried by each saidrod, the ends of'such rod being mounted in the openings formed in-theabutment plates, in such a manner as to permit angular movement betweenthe.

said guide rod and abutment plates but preventing lateral movement. I

driving chain comprising a plurality of links, including alternate pairsof inner and outer plates, an abutment plate, formed with an opening andbeing further provided with a flange around said opening, and carried byeach pair of outer plates, a guide rod for each pair ofabutment platesand a spring carried by each said rod, the ends of said rod passingthrough the openbearings for the guide rod. i

tures.

GEORGE WADHAMS.

' ARTHUR THOMAS BEST.

greater than the di an elongated opening, carried five cents each,'byaddressing the Commissioner of Patents, WashillEWfi,D.G- 7' I i ingsformed in the I abutment plates, the

formed around said openings of a. palr of abutment plates providingextended

